21911814107 has 4 divisors (see below), whose sum is σ = 21927366840. Its totient is φ = 21896261376.

The previous prime is 21911814083. The next prime is 21911814121. The reversal of 21911814107 is 70141811912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21911814107 - 2⁸ = 21911813851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21911814137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7774253 + ... + 7777070.

It is an arithmetic number, because the mean of its divisors is an integer number (5481841710).

Almost surely, 2^21911814107 is an apocalyptic number.

21911814107 is a deficient number, since it is larger than the sum of its proper divisors (15552733).

21911814107 is a wasteful number, since it uses less digits than its factorization.

21911814107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15552732.

The product of its (nonzero) digits is 4032, while the sum is 35.

The spelling of 21911814107 in words is "twenty-one billion, nine hundred eleven million, eight hundred fourteen thousand, one hundred seven".